Readme: Fileset for USN Research Data Archive -------------------- GENERAL INFORMATION -------------------- TITLE FOR THE FILESET Zemax files for optimization of schematic eyes of Norwegian 16- and 18-year- olds. Includes example and 'how to' guide. CONTACT INFORMATION Professor Rigmor C. Baraas University of South-Eastern Norway Hasbergs vei 36 3616 Kongsberg Norway rigmor.baraas@usn.no LANGUAGE English ----------------- FILE INFORMATION ----------------- The fileset consists of two Zemax files representing the three-surface schematic eye models, an instruction file, and a sample file: i) Zemax file: Bi-conic schematic eye model ii) Zemax file: Spherical schematic eye model iii) Instruction file - showing an example of how to use the Zemax files iv) Sample file - example data for one participant Filenames: i) Gullstrand_Spect_SCA_Bi_Cornea.zmx ii) Gullstrand_Spect_SER_Spher_Cornea.zmx iii) Example_Zemax_eye_model.pdf iv) sample.csv More information is to be found in the section "Additional information" below, as well as in: Hagen LA, Gilson SJ, Akram MN, Baraas RC. Emmetropia is maintained despite continued eye growth from 16 to 18 years of age. Invest Ophthalmol Vis Sci. 2019;60:4178– 4186. https://doi.org/10.1167/ iovs.19-27289 ----------------------- ADDITIONAL INFORMATION ----------------------- i) BI-CONIC SCHEMATIC EYE MODEL Filename: Gullstrand_Spect_SCA_Bi_cornea.zmx This file represents the three-surface schematic eye model including the cycloplegic sphereocylindrical refraction (sphere, cylinder and axis information) at a 13.5 mm vertex distance and a bi-conic cornea with measured corneal curvature in the steepest and flattest meridians along with the corresponding axes. The Sphere value Sph (Diopters) is implemented in the row "1" in the Zemax worksheet. The value 1000/Sph (Sph is in Diopter) should be entered in the column "Focal length". The cylinder-Axis value is implemented by a coordinate rotation in the row "2" and inverse rotation in the row "4. The value "Cyl_Axis-90" in degrees should be entered in the column "Tilt about Z", where "Cyl_Axis" is the measured cylinder-Axis value in degrees. The inverse rotation will be automatically calculated by Zemax and the user does not need to enter it. The Cylinder value Cyl (Diopters) is implemented in the row "3". The value "Cyl/1000" should be entered in the column "X-power", where "Cyl" is the measured cylinder value in Diopters. A Bi-conic cornea (with different x- and y-radius of curvature) is implemented in the row "6". The y-radius of curvature should be entered in the column "Radius" and x-radius of curvature should be entered in the column "X-radius". Enter the distance from the anterior cornea to the lens front surface (ACD; anterior chamber depth) into the “Thickness” column on row “6”. The axis of the x-radius of cornea with respect to horizontal is entered in the row "5" in the column "Tilt about Z", and it is automatically reversed by Zemax in the row "7" to bring the coordinate system back to its original orientation. The Axis value is measured counterclockwise starting from the horizontal line. The crystalline lens is entered in the rows "8" and "9". Lens front radius and thickness of the lens (LT; crystalline lens thickness) in Row "8", and Lens back radius and distance to retina (VCD; vitreous chamber depth) in Row "9" (all in mm) should be entered. The merit function is also given which optimizes the on-axis RMS wavefront error. It also keeps the ratio of lens front surface power to the total lens power ( = 38.0%), and lens back surface power to the total lens power ( = 63.3%), same as used in the Gullstrand-Emsley model. ii) SPHERICAL SCHEMATIC EYE MODEL Filename: Gullstrand_Spect_SER_Spher_cornea.zmx This file represents the three-surface eye model including the spherical spectacle correction equal to the measured cycloplegic spherical equivalent refraction at a 13.5 mm vertex distance. The Spectacle correction value M=S+C/2 (Diopters) is implemented in the Row "1" in the Zemax worksheet. In the Column "Focal length", one should enter 1000/M value, where M should be in Diopters. The cornea is implemented in the Row "6", where the Corneal radius should be entered, and the Thickness from Cornea to Lens front surface (ACD; anterior chamber depth) should be entered (all in mm). The crystalline lens data is entered in the rows "8" and "9". Lens front radius and thickness of the lens (LT; crystalline lens thickness) in Row "8", and Lens back radius and distance to retina (VCD; vitreous chamber depth) in Row "9" (all in mm) should be entered. The merit function is also given which optimizes the on-axis RMS wavefront error. It also keeps the ratio of lens front surface power to the total lens power (= 38.0%), and lens back surface power to the total lens power (= 63.3%), same as used in the Gullstrand-Emsley model. ---------- REFERENCE ---------- Hagen LA, Gilson SJ, Akram MN, Baraas RC. Emmetropia is maintained despite continued eye growth from 16 to 18 years of age. Invest Ophthalmol Vis Sci. 2019;60:4178– 4186. https://doi.org/10.1167/ iovs.19-27289